US3751217A - Rotary kiln precooler construction - Google Patents

Rotary kiln precooler construction Download PDF

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Publication number
US3751217A
US3751217A US00223150A US3751217DA US3751217A US 3751217 A US3751217 A US 3751217A US 00223150 A US00223150 A US 00223150A US 3751217D A US3751217D A US 3751217DA US 3751217 A US3751217 A US 3751217A
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US
United States
Prior art keywords
cylindrical portion
precooler
set forth
rotary kiln
construction set
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00223150A
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English (en)
Inventor
W Schossler
O Heinemann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ThyssenKrupp Industrial Solutions AG
Original Assignee
Polysius AG
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Filing date
Publication date
Application filed by Polysius AG filed Critical Polysius AG
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Publication of US3751217A publication Critical patent/US3751217A/en
Anticipated expiration legal-status Critical
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories or equipment specially adapted for rotary-drum furnaces
    • F27B7/38—Arrangements of cooling devices
    • F27B7/40—Planetary coolers

Definitions

  • This invention relates to a rotary kiln with a precooler connected to its outlet, the precooler having a diameter greater than that of the rotary kiln and being connected to cooling tubes disposed in satellite manner relative to the kiln axis.
  • a rotary kiln of the general type to which the invention relates is known and in which cooling tubes disposed in satellite manner are connected by their inlet stubs to the peripheral area of the precooler which has the maximum diameter.
  • the axes of the precooler outlets are generally perpendicular to the axis of the rotary kiln.
  • the hot material discharged from the rotary kiln outlet is intended to be precooled before its entry into the cooling tubes.
  • lf cement clinker for instance, is processed in a rotary kiln, very coarse material usually emerges from the kiln outlet.
  • both the precooler outlets and the cooling tube inlet stubs are subjected to considerable impact and temperature stresses, which results in rapid wear and hence frequent replacement of these parts and also of the linings in these regions. Also, since the emerging coarse clinker is generally of very irregular shape, there are frequently troublesome stoppages caused by the larger lumps during their transit from the precooler to the cooling tubes.
  • the object of the invention is therefore to provide a rotary kiln of the type described which, as compared with known constructions, ensures considerably improved precooling of the fired material, together with reduced susceptibility to wear and stoppages in the above-mentioned parts.
  • this object is achieved in that the cooling tubes are connected to the end face of the precooler remote from the rotary kiln outlet, and the section of the precooler lying between the rotary kiln outlet and the cooling tubes has a grooved lining.
  • the fired material must first pass the grooved lining of the precooler before it can enter the cooling tubes connected to the end face. Because of the considerably increased internal surface of the precooler as compared with known constructions, the material is more strongly cooled as it passes the grooved lining. In addition at least those lumps of material which are less strongly burned together are largely broken down, so that these pieces can no longer lead to stoppages inthe region of the cooling tube inlets.
  • cooling tubes are connected to the end face remote from the rotary kiln outlet, there is a relatively careful transition from the precooler into the cooling tubes, whereby the impact effect of the coarser pieces of material, which in the known designs led to rapid wear and to damage, is largely prevented.
  • the precooler has a cylindrical part which is connected to the rotary kiln outlet by a conical part which flares or tapers against the feed direction of the material, and whose inner side in general supports the grooved lining.
  • the grooved lining can be provided in the precooler in relatively simple manner.
  • the centre axes of the material outlet apertures of the precooler leading to the cooling tubes lie on an imaginary circle whose diameter is less than that of the cylindrical part of the precooler.
  • the grooved lining is formed either with straight grooves running generally parallel to the longitudinal axis of the rotary kiln or with generally helical grooves, these grooves in either case being directed towards the individual material outlets in the precooler. In this way the time the material spends in the precooler can be matched to the output of the rotary kiln.
  • the cooling tubes lie parallel to the rotary kiln axis, and to be supported on a carrier pipe which is connected to the end face of the precooler joined to the cooling tubes, and is generally coaxial with the kiln and with the cylindrical part of the precooler. This provides a particularly robust construction of the rotary kiln in accordance with the invention.
  • FIG. 1 is a partial view, partly cut away, of a rotary kiln precooler constructed in accordance with the invention.
  • FIG. 2 is a cross-section through the precooler on the line IIII of FIG. 1.
  • FIG. 1 only shows the outlet 1 of the actual rotary kiln.
  • This rotary kiln outlet 1 is connected to the precooler 2 provided by the inventionQand has an outlet 3 remote from the rotary kiln outlet to which are connected cooling tubes 4 (only two shown) which are dis.- posed in satellite manner about theaxis 5 of the rotary kiln.
  • the precooler 2 consists in general of a conical, flared inlet part 6, a cylindrical part7 and the tapered outlet 3 already referred to.
  • the conical'part 6 tapers against the direction offeed of material (arrow 8) and its edge with the smallest diameter is connected to the rotary kiln outlet 1.
  • the cylindrical part 7 of the precooler At the opposite end of the cone (with the largest diameter) there is attached the cylindrical part 7 of the precooler, which thus has a considerably larger diameter than the rotary kiln.
  • the axial length L of this cylindrical part 7 to be no greater, and preferably less, than the diameter D of the rotary kiln.
  • the inside of the cylindrical part 7 carries a grooved lining 9, having straight grooves 10 lying generally parallel to the longitudinal axis 5 of the rotary kiln (see also FIG. 2). Each groove is disposed so that it is directed toward an outlet aperture 11 for material from the precooler 2.
  • the grooves in the grooved lining may be generally helical (see dotted line groove 10 in FIG. I).
  • the outlet 3 of the cooler 2 remote from the rotary kiln outlet 1 consists of a number of conical parts 3', 3" and an aperture 12 coaxial with the longitudinal axis 5 of the rotary kiln.
  • the conical part 3 directly attached to the cylindrical part includes the material outlet apertures I], referred to above, of the precooler 2.
  • the centre axes of the material outlet apertures l 1 lie on an imaginary circle whose diameter D, is smaller than the diameter D of the cylindrical part 7 of the cooler.
  • the cooling tubes 4 are parallel to the rotary kiln axis 5 and extend in a direction opposite to the kiln outlet 1.
  • the longitudinal axes 4 of the cooling tubes 4 also lie on an imaginary circle, whose diameter D is however larger than the diameter D of the circle on which lie the material outlets 1 l.
  • the cooling tubes 4 are connected to the end wall 3 or to the conical part 3' thereof by stubs 13 which are inclined relative to the longitudinal axes 4' of the cooling tubes.
  • Each cooling tube 4 or its stub 13 is connected to a precooler outlet aperture 1 l.
  • the conical part 3" of the outlet 3 is connected to a carrier pipe 14, substantially coaxial with the kiln and with the cylindrical part 7 of the precooler.
  • the cooling tubes 4 are supported on this carrier pipe 14 by suitable supports 17.
  • This carrier pipe 14 can be provided at its free end with a support ring (not shown) mounted on rollers or the like.
  • the carrier pipe is mounted a burner 15 (indicated only), which passes through the precooler 2 into the rotary kiln itself.
  • the burner 15 thus passes through the aperture 12 in the end wall 3', which otherwise is preferably closed by a cover 16.
  • the outlet end wall of cooler 2 can, if desired, comprise a generally straight, non-tapered wall.
  • the precooler 2 can have observation holes and means which will permit an operative to break up any large lumps of material which may be difficult to reduce in size.
  • a precooler adapted for use with a rotary kiln comprising a hollow body rotatable about a substantially horizontal axis, said body having a cylindrical portion; a flared inlet in communication with one end 4 of said cylindrical portion; and 'a plurality of spaced outlet openings in communication with the'other end of said cylindrical portion, said outlet openings being spaced circumferentially about a circle having a diameter less than that of said cylindrical portion.
  • connecting means comprise radially outwardly inclined stubs interposed between said body and said tubes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Furnace Details (AREA)
  • Incineration Of Waste (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
US00223150A 1971-02-25 1972-02-03 Rotary kiln precooler construction Expired - Lifetime US3751217A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712109065 DE2109065B2 (de) 1971-02-25 1971-02-25 Drehrohrofen mit an seinem auslauf angeschlossenem vorkuehler

Publications (1)

Publication Number Publication Date
US3751217A true US3751217A (en) 1973-08-07

Family

ID=5799845

Family Applications (1)

Application Number Title Priority Date Filing Date
US00223150A Expired - Lifetime US3751217A (en) 1971-02-25 1972-02-03 Rotary kiln precooler construction

Country Status (7)

Country Link
US (1) US3751217A (enrdf_load_stackoverflow)
JP (1) JPS5221989B1 (enrdf_load_stackoverflow)
BR (1) BR7201014D0 (enrdf_load_stackoverflow)
DE (1) DE2109065B2 (enrdf_load_stackoverflow)
FR (1) FR2127735A5 (enrdf_load_stackoverflow)
GB (1) GB1337350A (enrdf_load_stackoverflow)
ZA (1) ZA72694B (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3846067A (en) * 1972-08-22 1974-11-05 Polysius Ag Rotary furnace
CN103175403A (zh) * 2011-12-21 2013-06-26 中铝国际技术发展有限公司 电煅烧炉的中心部位冷却装置

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5542962U (enrdf_load_stackoverflow) * 1978-09-14 1980-03-19
JPS6156897U (enrdf_load_stackoverflow) * 1984-09-17 1986-04-16
JPS63173099U (enrdf_load_stackoverflow) * 1987-05-01 1988-11-10
JP3004180U (ja) * 1994-05-12 1994-11-08 護 小島 安全消火型煙草吸殻器

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1008974A (en) * 1910-09-15 1911-11-14 Smidth & Co As F L Rotary kiln.
US1675416A (en) * 1926-02-12 1928-07-03 Smidth & Co As F L Rotary kiln and cooler
US2845259A (en) * 1954-10-07 1958-07-29 Smidth & Co As F L Combined kiln and cooler
FR1332702A (fr) * 1962-06-07 1963-07-19 Refroidisseur rotatif
US3358977A (en) * 1965-08-05 1967-12-19 Smidth & Co As F L Rotary kiln installations
US3502139A (en) * 1967-03-22 1970-03-24 Smidth & Co As F L Planetary coolers for use with rotary kilns
US3547418A (en) * 1967-09-22 1970-12-15 Smidth & Co As F L Rotary kilns with cooler tubes

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1008974A (en) * 1910-09-15 1911-11-14 Smidth & Co As F L Rotary kiln.
US1675416A (en) * 1926-02-12 1928-07-03 Smidth & Co As F L Rotary kiln and cooler
US2845259A (en) * 1954-10-07 1958-07-29 Smidth & Co As F L Combined kiln and cooler
FR1332702A (fr) * 1962-06-07 1963-07-19 Refroidisseur rotatif
US3358977A (en) * 1965-08-05 1967-12-19 Smidth & Co As F L Rotary kiln installations
US3502139A (en) * 1967-03-22 1970-03-24 Smidth & Co As F L Planetary coolers for use with rotary kilns
US3547418A (en) * 1967-09-22 1970-12-15 Smidth & Co As F L Rotary kilns with cooler tubes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3846067A (en) * 1972-08-22 1974-11-05 Polysius Ag Rotary furnace
CN103175403A (zh) * 2011-12-21 2013-06-26 中铝国际技术发展有限公司 电煅烧炉的中心部位冷却装置
CN103175403B (zh) * 2011-12-21 2014-10-29 中铝国际技术发展有限公司 电煅烧炉的中心部位冷却装置

Also Published As

Publication number Publication date
DE2109065A1 (enrdf_load_stackoverflow) 1972-05-25
DE2109065B2 (de) 1972-05-25
FR2127735A5 (enrdf_load_stackoverflow) 1972-10-13
ZA72694B (en) 1972-11-29
BR7201014D0 (pt) 1973-05-17
JPS5221989B1 (enrdf_load_stackoverflow) 1977-06-14
GB1337350A (en) 1973-11-14

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